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Notebook turning on and off right after HP logo shows

Hello, I need a help with HP ProBook 430 G2. 

Recently, it has begun to show me an alert that my storage capacity is very low and I should change the battery, but when I clicked enter, the notebook continued to work properly ( even without being connected to electricity) .

Yesterday,alert the came again, but after hitting enter, the alert showed again and again and I could not log in . I tried to pull the battery out and start the notebook only on electricity , but the screen was flashing , turning on and off ( i could only access the bios start up menu). So I went to buy a completely new battery , but it does the same thing - the computer is turning on and off all the time, sometimes even some weird symbols occur on the screen (photo attached). 

Any help would be very appreciated, thank you. 


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